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22

Apr'20

A Diode

Objective Learn about a diode Let’s begin! A diode is a semiconductor device that consists of two terminals.   Diode   It allows electricity to flow in one direction but blocks it in the opposite direction. This behavior of the diode can be used to convert alternating current (AC) to Direct current (DC). They also find application in logic circuits.     Anode and Cathode in a Diode   The White strip at one end of the diode signifies that that end is the cathode (-) end. Working of a Diode The figure below is a simple circuit to show the working of a diode. When a positive (+) voltage is given to the anode (+) and a negative (-) voltage is given to the cathode (-), the Diode is said to be Forward biased. The diode will allow current to flow in this condition. When a negative (-) voltage is given to the anode (+) and a positive (+) voltage is given to the cathode (-), the Diode is said to be Reverse biased. The diode will not allow current to flow in this condition. In the first case, we see that when a sufficient voltage is given to the…

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22

Apr'20

A Potentiometer

Objective Learn about potentiometer Let’s begin! A Potentiometer, usually called a pot, is essentially a voltage divider circuit combined into one package. Depending on your requirements, you get large, bulky, high power potentiometers for electrical circuits and also small, lightweight, low power potentiometer for electronic circuits.   Single-turn Potentiometer Used for large currents – electrical applications   Trimmer Potentiometer Used for large currents – electrical applications   It is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or a rheostat. It has 3 terminals, 2 fixed ends at the extremes and 1 variable end in the middle. The extreme ends form the terminals of the resistor. So if the extreme ends are connected into a circuit, you will have a fixed resistance across these terminals. The variable end is where the position of the wiper plays an important role. As the knob on the resistor is moved, the wiper inside slides on the resistance plate and the resistances between the extreme ends and the variable end changes Terminals of the Potentiometer           Inside the Potentiometer   It is also commonly known…

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22

Apr'20

A Resistor

<h2>Objective</h2> <ul> <li>Learn about a Resistor</li> </ul> <h2>Let’s begin!</h2> A <b>Resistor</b> is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to: <ul> <li>reduce current flow</li> <li>adjust signal levels</li> <li>divide voltages</li> <li>bias active elements</li> <li>and terminate transmission lines, among other uses.</li> </ul> <img class=”aligncenter wp-image-7361″ src=”http://tqb.li2.in/wp-content/uploads/2018/07/Resistor-1.png” alt=”” width=”300″ height=”238″ /> <p style=”text-align: center;”><em>Axial leaded Resistor</em></p> &nbsp; High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for a generator. A resistor is represented as follows in a circuit diagram. <img class=” wp-image-10325 aligncenter” src=”https://tqb.li2.in/wp-content/uploads/2018/07/2000px-Resistor_symbol_America.svg-460×173.png” alt=”” width=”351″ height=”132″ /> <p style=”text-align: center;”><em>Resistor representation in a circuit</em></p> &nbsp; <h2>Color codes of Resistors</h2> Every resistor has a specific resistance value measured in ohms (Ω). Resistance values are chosen while designing circuits. Resistors are manufactured along with a color code, representing the resistance value. The most common type of color code used is the 4 band type. &nbsp; <img class=”aligncenter wp-image-4174 ” src=”https://tqb.li2.in/wp-content/uploads/2018/07/Resistor.png” alt=”” width=”443″ height=”182″ /> &nbsp; <p style=”text-align: center;”><a href=”http://tqb.li2.in/wp-content/uploads/2018/07/Resitor_table.png”><img class=”aligncenter wp-image-6852″ src=”http://tqb.li2.in/wp-content/uploads/2018/07/Resitor_table.png” alt=”” width=”400″ height=”496″ /></a><em>4 band color code of Resistors</em></p> &nbsp; <span style=”text-decoration: underline;”><ins>Examples </ins></span> <ul> <li>A resistor colored <i>Yellow-Violet-Orange-Gold</i> is 47 x10 kΩ with a tolerance…

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13

Apr'20

A Resistor

Objective Learn about a Resistor Let’s begin! A Resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to: reduce current flow adjust signal levels divide voltages bias active elements and terminate transmission lines, among other uses. Axial leaded Resistor   High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for a generator. A resistor is represented as follows in a circuit diagram. Resistor representation in a circuit   Color codes of Resistors Every resistor has a specific resistance value measured in ohms (Ω). Resistance values are chosen while designing circuits. Resistors are manufactured along with a color code, representing the resistance value. The most common type of color code used is the 4 band type.     4 band color code of Resistors   Examples A resistor colored Yellow-Violet-Orange-Gold is 47 x10 kΩ with a tolerance of +/- 5%. A resistor colored Green-Red-Gold-Silver is 5.2 Ω with a tolerance of +/- 10%. A resistor colored White-Violet-Black is 97 Ω with a tolerance of +/- 20%. The blank (20%) “band” is only used with the “4-band” code (3 colored bands + a blank “band”). When you see only three…

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